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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

The molecular biology of platelet-derived growth factor.

PDGF is a connective tissue mitogen that has been associated with clotted blood serum for at least 300 million years. It regulates the expression of cell cycle "early genes" in normal fibroblasts. Induction of early genes is preceded by stimulation of a tyrosine-specific kinase. The putative structural gene for PDGF has been acquired by an acutely transforming retrovirus and is expressed in many connective tissue tumors. Further work is needed to determine whether (i) production of PDGF by tumor cells confers a proliferative advantage on these cells, (ii) tyrosine-specific phosphorylations mediate the induction of cell cycle early genes by PDGF, and (iii) products of cell cycle early genes play any functional role in the 10-12 hr chain of events that culminates in replicative DNA synthesis and cell division. In the meantime, these very issues represent candidate functions for other viral oncogenes and their cellular homologs. Some of these genes could act at the onset of the mitogenic cascade by causing the production of automitogenic growth factors. Others may function in the interior of the cascade by promoting tyrosine-specific phosphorylations. Still others may be mutated or rearranged homologs of cell cycle early genes whose expression is normally modulated by extracellular growth factors.[1]

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